Some models are presented in this paper which extend the concept of measuring superefficiency to the useful case of variable returns-to-scales (VRS), thus enabling the ranking of efficient as well as inefficient units. Two models, namely the Universal Radial Model and the Universal Additive...

Chapter 1: Data Envelopment Analysis -- Chapter 2: Envelopment DEA Models -- Chapter 3: Multiplier DEA Model -- Chapter 4: DEA Cross Efficiency -- Chapter 5: Slack-Based DEA Models -- Chapter 6: Measure-Specific DEA Models.- Chapter 7: Non-radical DEA Models and DEA with Preference -- Chapter 8:...